From what I have heard, Niagara CAN be more expensive, but It depends on how many particles you are spawning when you make your systems with it… if I am correct haha. Don’t quote me… I am still working through reading all the Water System code and blueprints to figure out what is causing the system to only work at Z-index 0. It doesn’t make much sense logically. The issue sounds like somewhere in the code it reads the z-index of the fluid sim and compares it to the z-index of the water, or the water depth, to create the necessary splash and ripple effects at the proper height based on those parameters. However, I have not located this yet haha